'use strict'


function area_of_circle(r,pi){
    var s=r*r*pi;
    return s;
    
}

console.log(area_of_circle(2,3.14));

function max(a,b){
    if(a>b){
        return a;
    }else{
        return b;
    }
}
console.log(max(15,20));